PROBLEM TO BE SOLVED: To provide a facial expression estimation device, an emotion determination device, a facial expression estimation method and a program capable of increasing the estimation accuracy of a person's facial expression. SOLUTION: An expression estimation device 1 acquires image data of a target person's face imaged by the image pickup device, and a normal face image data of the target person stored in a storage device in advance. Face image based on the estimation results of the angle estimation unit 4 and the angle estimation unit 4 that estimate the angle of the face of the target person from the acquired face image data acquisition unit 3 and the image data acquired by the imaging data acquisition unit 2. The facial expression of the target person is compared with the correction unit 4 for correcting the face image data acquired by the data acquisition unit 3, the image data acquired by the imaging data acquisition unit 2, and the face image data corrected by the correction unit 5. A facial expression estimation unit 6 for estimating [Selection diagram] Fig. 1
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